Limitation of second-harmonic generation of femtosecond Ti:sapphire laser pulses

Multi-terawatt femtosecond laser system of visible range based on a photochemical XeF(C-A) amplifier

“…Finally, similar hybrid systems provide an alternative to direct nonlinear conversion of infrared radiation to the second harmonic in solid-state systems in which many problems arise with scaling of output radiation parameters in the visible spectrum to tens and hundreds of terawatt (Begishev et al, 2004;Mironov et al, 2009;Ginzburg et al, 2010).…”

Multi-modes of four-waves mixing at non-collinear interaction of laser beams in medium with cubic nonlinear response

“…Achievable values of 4 p in this case also belong to the interval, given by the two biggest roots, 3 3 4…”

“…As it is well-known, during the last thirty years the problem of frequency conversion of femtosecond laser pulse is a problem under investigation (see, for example [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and many other papers). Intensity of femtosecond pulses is sufficient to see simultaneously quadratic and cubic response of crystal at doubling frequency or at generation of the sum frequency wave (SFW).…”

Laser Pulse Contrast Ratio Cleaning in 100 TW Scale Ti: Sapphire Laser Systems

“…For example, close to 70 % second harmonics conversion efficiency can be obtained using a 1054 nm laser pulse with ps pulse duration into a KDP crystal of a few mm length at a laser intensity of 100 GW/cm 2 (Amiranoff et al, 1999). Second harmonic generation is more difficult for Ti:Sapphire high power laser systems with pulse durations between 25 -60 fs and an energy of several Joule ( Begishev et al, 2004;Marcinkevicius et al, 2003). A very short pulse duration requires that a thin doubling crystal be used because of the group velocity mismatch between the fundamental and the second harmonic wavelength at 800 and 400 nm respectively.…”